依据你说的 DS2019表上写的start date 是9.1
那么你可以在 8月2日至 9月30日 即9.1号的前后一个月（30天）内 持有效的签证入境
As a reminder, Section 214.2(j) as amended by the final rule states that a for a J exchange visitor, and J-2 spouse and children, the initial admission of an exchange visitor, spouse and children may not exceed the period specified on Form DS-2019, plus a period of 30 days for the purposes of travel.
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